Path tracking anti-saturation robust control method for under-actuated water surface ship

Abstract

The invention belongs to the technical field of path tracking control of under-actuated water surface ships, and particularly relates to a path tracking anti-saturation robust control method of an under-actuated water surface ship. According to the method, an error-limited sideslip compensation ECS-LOS guide law is designed, and a sideslip estimator is adopted to compensate a time-varying sideslipangle. According to the method, a path tracking robust controller is designed through a backstepping method, an interference observer is adopted to observe unknown synthetic interference in a system,and a saturation compensator is introduced into the designed robust controller in order to avoid the saturation phenomenon of an actuator. According to the method, the expected path can be tracked atthe expected speed on the premise that the under-actuated water surface ship does not violate the error limitation requirement and the actuator does not exceed the saturation range under the conditions of model uncertainty, unknown external environment interference, time-varying sideslip, tracking error limitation and actuator input saturation; and tracking errors can be converged near zero, so that the tracking precision is higher.

Description

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AI Technical Summary

Problems solved by technology

In most of the current literature, the ship path tracking control only realizes the local exponential stability of the control system or the consistent final boundedness of the closed-loop signal under the uncertain model and external environment disturbance, without considering the tracking error constraint problem. In other words, most of the literature only qualitatively analyzes the path tracking error without quantitative constraints

In addition, the actuator input saturation of underactuated surface ships is an objective problem, because the actuators have physical limitations, and the force and torque they can provide are limited

However, most of the existing ship path tracking control research results assume that the actuator can provide ideal force and torque, without considering the saturation limit of the actuator, so when appli

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